SOLUTION: if cos tetha-sin tetha=0 and 0 degree<tetha<90 degree,find the value of tetha. with out using trigonometric tables,evaluate:

Algebra ->  Trigonometry-basics -> SOLUTION: if cos tetha-sin tetha=0 and 0 degree<tetha<90 degree,find the value of tetha. with out using trigonometric tables,evaluate:      Log On


   

Question 784359: if cos tetha-sin tetha=0 and 0 degree
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
if cos tetha-sin tetha=0 and 0 < tetha < 90 degrees
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cos = sin
cos^2 = sin^2
cos^2 = 1 - cos^2
2cos^2 = 1
cos^2 = 1/2
cos = sqrt(2)/2
theta = 45 degs